Borg Running Perforated Tank - Breathable and Lightweight Performance: Elevate your running gear with the Björn Borg Borg Running Perforated Tank, designed for athletes who value breathability and comfort. Made from lightweight, recycled polyester, this tank top features perforated fabric for enhanced ventilation, keeping you cool during intense workouts. It offers a regular fit and is perfect for warmer weather or layering. Extra Product Details:. 100% Recycled Polyester Regular Fit Perforated Fabric for breathability Round Neckline Machine Washable. This tank is a must-have for runners looking for a combination of style and performance in their gear.